Projection display apparatus having a fresnel scrambler

1. A projection display apparatus comprising: a lamp; a liquid crystal display (LCD) panel; a scrambler disposed between the lamp and the liquid crystal display panel for making uniform a distribution of intensity of light at the LCD panel, the light being emitted from the lamp; and a Fresnel lens disposed between the lamp and the scrambler, for converting the light emitted from the lamp into light parallel to an optical axis of the scrambler, wherein the Fresnel lens has a negative optical power, the Fresnel lens refracting the light emitted from the lamp in a convergent form, thereby creating the light parallel to the optical axis of the scrambler.

2. The projection display apparatus according to claim 1, wherein the Fresnel lens is integrally incorporated with the scrambler.

3. The projection display apparatus according to claim 2, wherein the Fresnel lens is formed by etching an optical surface of the scrambler.

4. A projection display apparatus comprising: a lamp; a liquid crystal display (LCD) panel; a scrambler disposed between the lamp and the liquid crystal display panel for making uniform a distribution of intensity of light at the LCD panel, the light being emitted from the lamp; and a Fresnel lens disposed between the lamp and the scrambler, for converting the light emitted from the lamp into light parallel to an optical axis of the scrambler, wherein the Fresnel lens has a negative optical power, the Fresnel lens refracting the light emitted from the lamp in a convergent form, thereby creating the light parallel to the optical axis of the scrambler, wherein said light at said LCD panel emerging from said scrambler is substantially parallel to said optical axis of said scrambler .